• “Limestone (bioclastic packstone), medium to dark blue-grey, thickly bedded with thin shaly mudstone partings along uneven or wavy bedding planes. There is much crinoid debris throughout and there are many other beds rich in brachiopods and/or corals. The internal stratigraphy of the member is, in parts, remarkably consistent throughout the region and four informal divisions are recognised (Fairbairn, 1980), and referred to from the base upwards as the Bench, Main and Transitional posts and the Tumbler Beds. Beds rich in fossils are widespread. Most noteable and widespread are: the Chaetetes Band (Johnson, 1958) which occurs near the base; this comprises a sponge biostrome along with locally abundant brachiopods, corals and ostracods; within the Main Posts are the Brunton Band comprising the rare alga Calcifolium (Johnson, 1958; Cossey, et al, 2004), and the Frosterly Marble (Johnson, 1958). At the top, the Tumbler Beds, typically 2-5m thich, comprise thick beds of limestone interbedded with persistent mudstone units.”